Matrix properties
number of rows	18,010
number of columns	18,010
nonzeros	960,946
structural full rank?	yes
structural rank	18,010
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	C. Damhaug
editor	N. Gould, Y. Hu, J. Scott
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	3,010,842
Cholesky flop count	1.0e+09
nnz(L+U), no partial pivoting, with AMD	6,003,674
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	8,812,674
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	17,396,166

SVD-based statistics:
norm(A)	57.3369
min(svd(A))	1.97142e-202
cond(A)	2.9084e+203
rank(A)	2,912
sprank(A)-rank(A)	15,098
null space dimension	15,098
full numerical rank?	no
singular value gap	5.52151e+10

singular values (MAT file):	click here
SVD method used:	s = svd (full (A)) ;
status:	ok

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.